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Mobility of Sodium Ions in Silica Glass of Different OH Content
Author(s) -
SCHAEFFER; H. A.,
MECHA J.,
STEINMANN J.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb19074.x
Subject(s) - alkali metal , sodium , ion , ionic bonding , sodium silicate , inorganic chemistry , sodium oxide , chemistry , hydrogen , oxide , silicate , materials science , metallurgy , organic chemistry
Using 22 Na as a radiotracer, mobilities of sodium ions in various types of SiO 2 glasses were measured and found to depend on the OH content in the silica network. Increasing OH content in SiO 2 considerably reduces the Na mobility. The effect of immobilization of Na is discussed in terms of an interaction between hydrogen and sodium ions, similar to the “mixed‐alkali effect” in alkali silicate glasses. High OH‐containing SiO 2 , structures display the lowest diffusivities of either sodium or hydrogen ions, thus indicating properties which are preferential in practice, such as decreasing ionic instabilities in metal‐oxide‐semiconductor devices.